kichikuou 55837e5115 Remove xcore graphics backend ...

This removes X11 specific code, making SDL2 a hard dependency.
X-based environments are continue to be supported via SDL2.

This also removes joystick_linux.c which was only used if SDL2 was not
available.

2020-10-01 21:27:59 +09:00

..

workflows

Remove xcore graphics backend

2020-10-01 21:27:59 +09:00